# SPDX-FileCopyrightText: All Contributors to the PyTango project
# SPDX-License-Identifier: LGPL-3.0-or-later

"""
This is an internal PyTango module.
"""

__all__ = ("Group", "group_init")

__docformat__ = "restructuredtext"

import collections.abc

from tango._tango import __Group as _RealGroup
from tango.utils import _get_command_inout_param
from tango.utils import seq_2_StdStringVector, is_non_str_seq, is_pure_str
from tango.utils import _get_device_fqtrl_if_necessary
from tango.utils import _trace_client
from tango.device_proxy import __init_device_proxy_internals as init_device_proxy


def _apply_to(fn, key):
    if isinstance(key, slice):
        if key.step:
            return [fn(x) for x in range(key.start, key.stop, key.step)]
        else:
            return [fn(x) for x in range(key.start, key.stop)]
    else:
        return fn(key)


def _get_one_item(group, key):
    x = group.get_group(key)
    if x is not None:
        return x
    return group.get_device(key)


# I define Group as a proxy to __Group, where group is the actual
# C++ Tango::Group object. Most functions just call the __group object
# and are defined dynamically in __init_proxy_Group, also copying it's
# documentation strings.
# The proxy is useful for add(group). In this case the parameter 'group'
# becomes useless. With the proxy we make that parameter come to live
# again before returning.
# Another function that needs to be adapted to this is get_group because
# we want to return a Group, not a __Group!
# The get_device method also needs to be adapted in order to properly
# initialize the returned proxy with its python attributes.
class Group:
    """A Tango Group represents a hierarchy of tango devices. The hierarchy
    may have more than one level. The main goal is to group devices with
    same attribute(s)/command(s) to be able to do parallel requests."""

    def __init__(self, name):
        if is_pure_str(name):
            name = _RealGroup(name)
        if not isinstance(name, _RealGroup):
            raise TypeError("Constructor expected receives a str")
        self.__group = name

    def add(self, pattern_subgroup, timeout_ms=-1):
        """
        add(self, device, timeout_ms=-1) -> None
        add(self, device_list, timeout_ms=-1) -> None
        add(self, subgroup, timeout_ms=-1) -> None


        Throws     : TypeError, ArgumentError

            Attaches any device which name matches one of the specified patterns.

            This method first asks the Tango database the list of device names
            matching one the patterns. Devices are then attached to the group in
            the order in which they are returned by the database.

            Any device already present in the hierarchy (i.e. a device belonging to
            the group or to one of its subgroups), is silently ignored but its
            client side timeout is set to timeout_ms milliseconds if timeout_ms
            is different from -1.

            Parameters :
                - device        : (str)a simple device name or a device name pattern (e.g. domain_*/ family/member_*),
                - device_list   : (sequence<str>)  a sequence of these of  a simple device names or
                                    a device name patterns (e.g. domain_*/ family/member_*),
                - subgroup      : (Group) a Group to be attached as subgroup.
                - timeout_ms    : (int) If timeout_ms is different from -1, the client
                                side timeouts of all devices matching the
                                specified patterns are set to timeout_ms
                                milliseconds.
            Return     : None

            Throws     : TypeError, ArgumentError

        """
        if isinstance(pattern_subgroup, Group):
            name = pattern_subgroup.__group.get_name()
            self._add(pattern_subgroup.__group, timeout_ms)
            pattern_subgroup.__group = self.get_group(name)
        else:
            self._add(pattern_subgroup, timeout_ms)

    def _add(self, patterns_or_group, timeout_ms=-1):
        if isinstance(patterns_or_group, _RealGroup):
            items = patterns_or_group
        else:
            if is_pure_str(patterns_or_group):
                items = [patterns_or_group]
            elif is_non_str_seq(patterns_or_group):
                items = patterns_or_group
            else:
                raise TypeError(
                    "Parameter patterns_or_group: Should be Group, "
                    "str or a sequence of strings."
                )

            # If TestContext active, each short TRL is replaced with a fully-qualified
            # TRL, using test server's connection details.  Otherwise, left as-is.
            items = [_get_device_fqtrl_if_necessary(item) for item in items]
            items = seq_2_StdStringVector(items)

        resp = self.__group._add(items, timeout_ms)
        return resp

    def remove(self, patterns, forward=True):
        """
        remove(self, patterns, forward=True) -> None

            Removes any group or device which name matches the specified pattern.

            The pattern parameter can be a group name, a device name or a device
            name pattern (e.g domain_*/family/member_*).

            Since we can have groups with the same name in the hierarchy, a group
            name can be fully qualified to specify which group should be removed.
            Considering the following group:

                ::

                    -> gauges
                    | -> cell-01
                    |     |-> penning
                    |     |    |-> ...
                    |     |-> pirani
                    |          |-> ...
                    | -> cell-02
                    |     |-> penning
                    |     |    |-> ...
                    |     |-> pirani
                    |          |-> ...
                    | -> cell-03
                    |     |-> ...
                    |
                    | -> ...

            A call to gauges->remove("penning") will remove any group named
            "penning" in the hierarchy while gauges->remove("gauges.cell-02.penning")
            will only remove the specified group.

            Parameters :
                - patterns   : (str | sequence<str>) A string with the pattern or a
                               list of patterns.
                - forward    : (bool) If fwd is set to true (the default), the remove
                               request is also forwarded to subgroups. Otherwise,
                               it is only applied to the local set of elements.
                               For instance, the following code remove any
                               stepper motor in the hierarchy:

                                   root_group->remove("*/stepper_motor/*");

            Return     : None

            Throws     :
        """
        if isinstance(patterns, str):
            return self.__group._remove(patterns, forward)
        elif isinstance(patterns, collections.abc.Sequence):
            std_patterns = seq_2_StdStringVector(patterns)
            return self.__group._remove(std_patterns, forward)
        else:
            raise TypeError("Parameter patterns: Should be a str or a sequence of str.")

    def get_device(self, name_or_index):
        proxy = self.__group.get_device(name_or_index)
        if proxy is None:
            raise KeyError(f"Group does not have device {name_or_index}")
        init_device_proxy(proxy)
        return proxy

    def get_group(self, group_name):
        internal = self.__group.get_group(group_name)
        if internal is None:
            return None
        return Group(internal)

    def __contains__(self, pattern):
        return self.contains(pattern)

    def __getitem__(self, key):
        fn = lambda x: _get_one_item(self, x)
        return _apply_to(fn, key)

    def __delitem__(self, key):
        fn = lambda x: self.remove(x)
        return _apply_to(fn, key)

    def __len__(self):
        return self.get_size()

    def __repr__(self):
        return "Group(%s)" % self.get_name()

    @_trace_client
    def command_inout(self, cmd_name, param=None, forward=True):
        """
        command_inout(self, cmd_name, forward=True) -> sequence<GroupCmdReply>
        command_inout(self, cmd_name, param, forward=True) -> sequence<GroupCmdReply>
        command_inout(self, cmd_name, param_list, forward=True) -> sequence<GroupCmdReply>

        Just a shortcut to do:
            self.command_inout_reply(self.command_inout_asynch(...))

        Parameters:
            - cmd_name   : (str) Command name
            - param      : (any) parameter value
            - param_list : (tango.DeviceDataList) sequence of parameters.
                           When given, it's length must match the group size.
            - forward    : (bool) If it is set to true (the default) request is
                            forwarded to subgroups. Otherwise, it is only applied
                            to the local set of devices.

        Return : (sequence<GroupCmdReply>)

        """
        idx = self.command_inout_asynch(cmd_name, param, forward)
        return self.command_inout_reply(idx)

    @_trace_client
    def command_inout_asynch(self, cmd_name, param=None, forward=True):

        if param is None:
            idx = self.__group.command_inout_asynch(
                cmd_name, forget=False, forward=forward
            )
        else:
            arg_in = _get_command_inout_param(self.__group, cmd_name, param)
            idx = self.__group.command_inout_asynch(
                cmd_name, arg_in, forget=False, forward=forward
            )

        return idx

    @_trace_client
    def read_attribute(self, attr_name, forward=True):
        """
        read_attribute(self, attr_name, forward=True) -> sequence<GroupAttrReply>

            Just a shortcut to do:
                self.read_attribute_reply(self.read_attribute_asynch(...))

        """
        idx = self.__group.read_attribute_asynch(attr_name, forward)
        return self.__group.read_attribute_reply(idx)

    @_trace_client
    def read_attributes(self, attr_names, forward=True):
        """
        read_attributes(self, attr_names, forward=True) -> sequence<GroupAttrReply>

            Just a shortcut to do:
                self.read_attributes_reply(self.read_attributes_asynch(...))
        """
        idx = self.__group.read_attributes_asynch(attr_names, forward)
        return self.__group.read_attributes_reply(idx)

    @_trace_client
    def write_attribute(self, attr_name, value, forward=True, multi=False):
        """
        write_attribute(self, attr_name, value, forward=True, multi=False) -> sequence<GroupReply>

            Just a shortcut to do:
                self.write_attribute_reply(self.write_attribute_asynch(...))
        """
        idx = self.__group.write_attribute_asynch(
            attr_name, value, forward=forward, multi=multi
        )
        return self.__group.write_attribute_reply(idx)


def group_init():
    proxy_methods = [
        # 'add',  # Needs to be adapted
        # "command_inout_asynch",  # Needs to be adapted
        "command_inout_reply",
        "contains",
        "disable",
        "enable",
        # 'get_device',  # Needs to be adapted
        "get_device_list",
        "get_fully_qualified_name",
        # 'get_group',   # Needs to be adapted
        "get_name",
        "get_size",
        "is_enabled",
        "name_equals",
        "name_matches",
        "ping",
        "read_attribute_asynch",
        "read_attribute_reply",
        "read_attributes_asynch",
        "read_attributes_reply",
        "remove_all",
        "set_timeout_millis",
        "write_attribute_asynch",
        "write_attribute_reply",
    ]

    def proxy_call_define(fname):
        def fn(self, *args, **kwds):
            return getattr(self._Group__group, fname)(*args, **kwds)

        fn.__doc__ = getattr(_RealGroup, fname).__doc__
        fn.__qualname__ = f"Group.{fname}"
        setattr(Group, fname, _trace_client(fn))

    for fname in proxy_methods:
        proxy_call_define(fname)

        # Group.add.__func__.__doc__ = _RealGroup.add.__doc__
        # Group.get_group.__func__.__doc__ = _RealGroup.get_group.__doc__
        # Group.__doc__ = _RealGroup.__doc__